| 摘要 |
PURPOSE: An environment-friendly automatic door opening and closing apparatus is provided to open and close a door safely and economically using a natural law without a power supply. CONSTITUTION: An environment-friendly automatic door opening and closing apparatus comprises: a door(1); a hanger assembly including a hanger(11) provided with a rail(12), a rotary shaft(13) fixing the center of the hanger to one side of a building to make the hanger rotatable, and a bracket(14) provided with a roller(14b) formed to be slidable along the rail; and a driving assembly including a switch(23) attached to one side of a doorframe(2) to be operated by a user, a driving unit transferring vertical driving force to a projection, which is formed on the lower part of the hanger, by the operation of the switch, and a controller controlling the driving unit to descend and restore the projection at the appointed interval after the projection ascends according to the operation of the switch. |
